Sintaxe e Estrutura da Linguagem Dart para Iniciantes

Portanto, neste artigo, vamos explorar de forma clara e concisa a Sintaxe e Estrutura da Linguagem Dart,

[{"selector":"#anim-ba4aba3a-1183-4d71-ab33-86a7ac362de0 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate3d(-31.249999886225726%, 0, 0) translate(-25%, 0%) scale(1.5)","translate3d(0%, 0, 0) translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"fill":"forwards"}] [{"selector":"#anim-8149de3a-b744-4418-93a1-c64f210d1a61","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e4a4a53f-25da-4192-abab-eef41fe64509","keyframes":{"transform":["translate3d(115.23810%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

O Básico da Sintaxe em Dart

[{"selector":"#anim-fbc93790-85e1-4261-907d-bcbd7f337dd1 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(18.611111178870015%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-fc6b97c1-e794-46f8-9ff2-2d1f55d1381b","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e1d951ab-c56f-46bb-86b0-52fc803d2232","keyframes":{"transform":["translate3d(-116.02564%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ac43b6cf-c725-4caa-be40-6c1b3bd5eb6d","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-cc4768c0-1246-4f85-b604-1cbaff82fc10","keyframes":{"transform":["translate3d(114.96816%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-53f5b595-eab9-48e2-a3cd-a30f822a095f","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-b315fccd-c817-42ca-ac08-ade87d2a9ce6","keyframes":{"transform":["translate3d(-115.28663%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-eb0ac28a-e98f-4865-ac3c-0003c437a014","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-246ee5ed-4725-4bb1-ba59-980e54f433fd","keyframes":{"transform":["translate3d(115.92356%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] Portanto, antes de mergulharmos em conceitos mais complexos, vamos entender os fundamentos da sintaxe de Dart. Em Dart, os comentários podem ser de duas formas: linha única, iniciados por "//", ou de múltiplas linhas, delimitados por "/ " e " /".

Variáveis

[{"selector":"#anim-bacc01ad-582a-46f7-b978-cf753dbcb3a5 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-b61d060e-275a-4115-8e4e-4fc177abcb7f","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-63c77dc1-53d9-481a-932d-12129acec7a4","keyframes":{"transform":["translate3d(0px, -212.55493%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d2076bf4-2056-456d-b364-2adcaed8489d","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-187761d0-ae3d-4ac0-a4e4-552c6276a532","keyframes":{"transform":["translate3d(-115.06411%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d0b5ef31-90c9-4355-a85b-6caeb92d6ce8","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ac9867a0-bf4c-4ff6-b784-26c20c00f0bd","keyframes":{"transform":["translate3d(116.34615%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] Para declarar uma variável, utilize a palavra-chave "var", seguida pelo nome da variável e seu valor atribuído.

Constantes

[{"selector":"#anim-a843f4dc-bebe-4630-89e9-6e7910ecb758 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate3d(7.812499744007886%, 0, 0)","translate3d(0%, 0, 0)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-f97191f7-1803-449f-86b9-e1701d7ef740","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0bd4904f-6676-4db3-a82a-565c222fee34","keyframes":{"transform":["translate3d(-115.2381%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-9271ac4a-e78d-46ed-bcd2-0c4ed818936e","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-3701e9ba-9aec-43eb-99f2-b9d731913e19","keyframes":{"transform":["translate3d(115.55555%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] As constantes em Dart são usadas para representar valores imutáveis, ou seja, valores que não podem ser alterados após sua definição.

Estrutura de Controle em Dart

[{"selector":"#anim-00e3d9e8-660b-4576-8e06-698fd035bd55 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(13.705556638319202%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-4643b4c4-7622-42db-8764-716c3ad35fac","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f3b89273-401e-43cc-aded-2372021738aa","keyframes":{"transform":["translate3d(116.34615%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-38358966-f1b3-494c-86af-aafcad01c4e2","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-c085d55a-2e7e-46d2-80df-7e8f97c5dc5d","keyframes":{"transform":["translate3d(-115.70512%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-e0ed53a5-aac7-4bbd-b871-0a23509b9ccf","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-67c5c4be-6a89-4310-80fe-f6ede7c167bd","keyframes":{"transform":["translate3d(115.92356%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] As estruturas de controle são fundamentais para controlar o fluxo de execução do programa e permitir que o código tome decisões com base em condições específicas.

Condições com if e else

[{"selector":"#anim-07c24bcc-5b00-4227-832a-2c4a8dcb51f7 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate3d(-14.843749786673241%, 0, 0)","translate3d(0%, 0, 0)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-d74c79fe-22a9-4ec3-b678-bad95ceff0c7","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-862fe718-133d-45b4-aa12-37c84f83bb96","keyframes":{"transform":["translate3d(-115.2381%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-cf33259b-8ae1-46b1-be7f-64085f27da38","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-05fb644d-9c8a-4c5b-9305-30e22e245b7a","keyframes":{"transform":["translate3d(114.92064%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] O código dentro do bloco "if" será executado se a condição especificada for verdadeira. No entanto, caso contrário, o bloco "else" será executado.

Loops com for e while

[{"selector":"#anim-b55ea85e-d8c8-43c0-a1c5-09bab6bb4d74 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(-8.71212125537425%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-a8a9e38f-6445-4321-afb3-8cff0e9fe101","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-5fa86d52-a5d8-446b-81a5-3e90a4b1ffa1","keyframes":{"transform":["translate3d(-114.8265%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-8a894bd6-d553-483a-babc-1885017f2658","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-2fca0038-d06a-4472-ad8a-d31434d74c49","keyframes":{"transform":["translate3d(115.87301%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f773af26-b118-4e74-8262-0941bd0e90af","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-344ffeae-daad-43fc-ae59-739b37235c3c","keyframes":{"transform":["translate3d(-114.92064%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] Os loops são usados para executar um bloco de código repetidamente até que uma condição seja atendida.

Continue aprendendo

[{"selector":"#anim-82ec8708-a311-4b14-b318-a800ded6d0ad [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(16.666666727346282%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-8ca4f2db-318d-4194-ad73-5db0eeb18185","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f0f3ab65-bd8a-4b89-8f67-3eb3ce5a3b4d","keyframes":{"transform":["translate3d(-115.2381%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-b1c0f0dc-f412-4821-ad4e-e523c74bb93b","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-894bbe77-e487-457c-b679-6ebe99cd48ba","keyframes":{"transform":["translate3d(115.55555%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] Confira mais detalhes e mais atalhos em nosso artigo completo . É só clicar abaixo ! Clique aqui!